908680639 has 2 divisors, whose sum is σ = 908680640. Its totient is φ = 908680638.

The previous prime is 908680637. The next prime is 908680667. The reversal of 908680639 is 936086809.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 908680639 - 2¹ = 908680637 is a prime.

Together with 908680637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 908680592 and 908680601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (908680631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454340319 + 454340320.

It is an arithmetic number, because the mean of its divisors is an integer number (454340320).

Almost surely, 2^908680639 is an apocalyptic number.

908680639 is a deficient number, since it is larger than the sum of its proper divisors (1).

908680639 is an equidigital number, since it uses as much as digits as its factorization.

908680639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 908680639 is about 30144.3301302252. The cubic root of 908680639 is about 968.5835559815.

The spelling of 908680639 in words is "nine hundred eight million, six hundred eighty thousand, six hundred thirty-nine".